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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fe95aab00a2a38ffd4e53aeef01d79ae85554c0347e2ba8c66503875ab21d9' 
  AND token = 'BWmY8/YkxrGMSycRGbDdSy9VLPr3JAmJTh135TWp7Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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