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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ee03d416fcc4660de4f4010867eb35a3cbd9d1699e70d4dd4e2aabe2d43df9' 
  AND token = 'kjyJZ7+rxMtF75qGdfq7WohyQNp0xncDf54LalZgaG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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