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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8381339e9d778db3896b6f2576de61341cebe1c0db89b6087f02a0077427a49' 
  AND token = 'qgVwhRNfCEJoCve2NwIODmNyLovF5uYUyO7ddte9E+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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