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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32ca7b8c265f3613d55f7d7885a0a34ded9beb27da2f8ddf19c7eebeb1ba7c9' 
  AND token = 'SJ9ayHTIO+9UYNXDAz9rlZ7JUp17osZykAFZ+g09RBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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