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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5c56ec637e70d07fe7d15bb47c167b380af950906d196fe1257262ea5cc91c' 
  AND token = '4HsIhIftgW4otDK0LvF1ZaI1kvmwOwhqrggoiU5B6vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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