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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc83f06e899ce3b8de0b0c7f3eb91ef1670944b1f3d67db2c39f067ecdd3ed9b' 
  AND token = '3i/zIIEASKBPTiF8t1hCcVvXbaHRlAWuF5HXwfOiLJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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