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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3988f1655596583b85f3fa6363b8de2794ce1f7cf4b5458cb1480ca941e82631' 
  AND token = 'bhTuAfS8YI1p/t/CMMV9PakGHUrRUjAmYrEUxj6TOIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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