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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66924c56963c614a7382efe02d9dccad3be5856e3c072c5cf5f5807af27cd25' 
  AND token = 'KfCqITxbxsfXhpXymMiSdo7KqaAa6dSZ2XjatRg6flE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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