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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa512c35d78d0b5addfd10a15843da67891db51c683595c0e9076e77e9e5afc' 
  AND token = '6QmMBeZaaK8o/8eO2jMgSJvf5yHYqe+6MEXRq2DbZrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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