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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f026e953bfe930f4e8f48681a55afe760882cc7f52332ce9edb84443cb3b9a76' 
  AND token = 'mBsnXyLdJeAFEcSn2VU3nqwoNzk6hbBBdL5Ehbhhhz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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