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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0420954ddcdf009667ce8f5be3092ef45376cee3a33ac8669c08e03bd6dbb69' 
  AND token = '7H+Sppv/VIVwVjArIkSxxAufwUcBYam8TyFen7eSb5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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