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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a639beb27b98a8b8b0dacf6373cbc732be210f0442c9b02b61ba59f38cc06843' 
  AND token = '/ZVkd3ZBR9/rQ5hiFAV0Zgm2NRayGdbd4ryhusRoHg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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