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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e658d7c513ba085e7267e20741cc1e2a51c8699c4307fc47627fbf955b395b4c' 
  AND token = 'cUfG1JUw1PI7Tof0849CQAh5YP9qa60h5kJ6FmPO9dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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