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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0b203898c0f16d34abee6b436d5d0833db4a7d425f3f8c6b5b88e6466d60cb' 
  AND token = 'tU0G6ZPq6A3yv3RV/edxE2ioTZafCbkRVV8/6B5ks/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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