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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb84bec9ac3902f2574f68d584dfa65748614d78880c4c4d42b0be473b8a24a' 
  AND token = '8Uw8HEKQO6FpdXuk71YVOknwQBnG8u1KDpmF3uAFpfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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