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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c357dae2ce219f46ec86fd01280447d214b99181eba8e76ca378e57236b311aa' 
  AND token = '4UVaTln8TT1dUbcnY2ose0YEDxu4Km9cc4x+GN4SB6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}