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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb93c496e20755ae5044c2ec99648e92696f2a4a400bdd51e410ef752479e0c' 
  AND token = 'hLqgG//y0miUMrqoD2aQ++htajY3rx3Oj+lUUZ6ZiHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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