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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b2d17ca699abb935f56ec501d4be2f5d08816dce4466547155ad43587d5902' 
  AND token = '/x2rygPvzXKtspxNrITQ0JxcberKFm5vlaW+Qpn5/tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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