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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de311bbd60bfb3fc8d5888da266db5e46df121342c643aa4d6f1fa74266bb3d1' 
  AND token = 'rP6zNYzaA0gCfDFy0meGc/Pw/KIVi2kyWXDTeKQAfWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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