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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2f37502ff14450a17069fc2cd5f1c8e4eae89704a642c5229236d82efa8398' 
  AND token = 'ZHCgiKlUYHNSYZH9Pv4kXRxraVeJTi7HzdwSadykqrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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