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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9741874c8fa823237d3922786daa0aa22c0e284b5eb550f7ac9d2cf370ff325' 
  AND token = '+O1Dasqvd0tJHVcobquQVi+3kqX6b+PykIblww9sGi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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