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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eee57c4244de6d3fe18773f4c513a85f62c2d2afe09341df39e09caeaaa6fd5' 
  AND token = '+oO8U2Fb0uOcWq1kfyNciEJCS3MvWOCfKVVPqEjsODc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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