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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3901ec6daf172a014c55a80a63e920531c22ada5fdd2367a3c297f4508d763bf' 
  AND token = 'xO9LqOFuV5qiVEloh397VgeMyjkFL7Xd+W1bOKuvXjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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