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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3527f16f0e8e5d56bfb43388994c6ca42f913a10de0a67bdfcab3912365133b0' 
  AND token = 'K03xKxL7FjHl9xL2LuLVdT682e9WgEwHxH7PIkfiZlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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