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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c573b5e897c87663556274443f18be727d145a40bf115b129338d9ea66b1ed' 
  AND token = 'oYuRrJSUVefTNISNGLu2d8U7yEOqZ9wqWLBSn9jRKSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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