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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e85dbcb97c9f9c5fbd7f504e22d7ecec3b7e7bd5bd212a6eb13eaccf0f3ff3' 
  AND token = '/zs3bbJ6/DP5+XSHGbua3LXHzp+1jAZZyzyNzhbuf/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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