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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020aa73bc532dc4ed7f511607abc8567e7db60ffd7585fa9d60c2527a9be4a3c' 
  AND token = '7xhNVIsDASeQiZd3mxgpwChS5AlQdJp5dNH12XN/nWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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