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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a8a540a6242679a28417a1487d35ce692d09a9e308b287a9456ab75de2d99a' 
  AND token = '9/OU9aGyj1jnkDOn+rW1APpeqSyHVSyR2/l0BGThIzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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