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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f09ed921d11d6d7cb86c8c4e318caa991daaaa1eb869ed00e26bc1ae4fedb9' 
  AND token = 'KxvT/XJ4K3h7lzYUsO6fBwKntk05pqtTHHTwl1IoFB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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