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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed7696ccee304aadbd1f0ba0f136ee29e1c56c97272159a909a94cd684cd14e' 
  AND token = 'fSWZ5z3mcS4C90Q7yAwWy5q0sgpg9AteE5VvWdKM5Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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