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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087fdc4eb3c11dbf35fb9b865b387e990cccbd6a8b6d186e2e53a77c85467f1d' 
  AND token = '9Hbs99K+xww+ih7191Smd2TXZJFUs0P8bXf1uXvF43o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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