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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d77bd7af83d426ccb2b7db502d8128e824fe6eb3c6da8128528bb8b655206c' 
  AND token = 'ZWcmbdmbC39QWIs3Y3lQ+LQC1K/lIV8adJKgDb00eMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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