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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdaed73ab6a4ea37beeee9ea7b07de58e1d665ce8c8b019cacaa5fa7a71ac8c' 
  AND token = '3HaxxAKfJ2H4Kn1ccTx0aBiTuW397lVMnqr2N+NN5qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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