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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1769d543f6aeedf617229988bb43dc3d1618595f45b29a9bbcd018c696bf2a76' 
  AND token = '94v+aYszemm/nJ+fJiiSuw+udTfmna3X4d6K7wp13n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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