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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956f4cfd77b29f9f9366cbecce6848ba4566bb696f67532a28cf5a729ed2b90d' 
  AND token = 'Kq4ouKDTpS3nJHRtHYOH2yiPskOBS4O2T1tD0v/V6Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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