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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5807f913deed1e977742f2fa3bee1ab59b3f4517948a5564bebf2d0ce7f8b40' 
  AND token = 'VVGK825hVqCHT9umOE4hs7mRQ9NGGpamU+Ab3854/K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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