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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fb84de3f99fa7dac1e5e8a71590489df61821951772fcd86b557710f5274bd' 
  AND token = 'hMSsxoy4JOphWy+QU/1lg2B1oH+yeWDUR/+cChZ+Fhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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