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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2947012a0c25a72129681ae36e45d59135ad6a97c3b27c93b8ee8eaf9cff12a1' 
  AND token = 'MmFAYy94+EnX9/ghzWJgb4j32Qx+yIqQDzjW8CsqddI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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