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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf81c1707f17ddddb228b2b6f0d541db195c7349432aafd18c1569084115f57b' 
  AND token = 'j1iQZOyKvMXfp9m4VcbVCAlko1Wzp3ceA663WN1pMms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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