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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee0c8cedb729f976c23f8f2bb2a7f3d2d65ea28d0a43ca61dfa4f60b9aad691' 
  AND token = 'qR611v3az+iBvlD9oc30h98Obaartn0F3s+vtg7+4AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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