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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e0bf99cbe6a3f6e516305d2ee31154242007a7758c5617be36a4bfeae25e63' 
  AND token = 'Hal3z6WUCTPQpvpEk4s4dRCijo9Z7g1dukJDjmn5LZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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