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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc83f504718453142d36bc3a6a6acb74c8e2e37e83f2becac84a76d3057e3483' 
  AND token = 'tKHLdjKP0PF9Z9+9HiQ4OkHBsp2pdiXzwNeor0rrcSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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