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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baeea4c339ce47eaf8bb7fc17eb33028407d3f3ace541d42f01f1e976d0934c' 
  AND token = '70YqEVw9cJ1C9W+GnfdSNS43HlITIkhLBR5b+1rqp7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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