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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd778cde58ab8fc9b7f386f6aa2fa69a85809229b1a94df9db7d6dea70d694e20' 
  AND token = 'V19bQwS1QnbEUQirB8GC4+iMPilkB7UmosFH/jXvvHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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