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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51bed7b9aa47247dc7766d6c453c177cf7c694a1221b602608c50e32061fd487' 
  AND token = 'x9QWLakbpIJ8InL/ZwnV8/nu8Y++NsRbyx5xjOl94rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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